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Financial Instruments (excluding derivatives) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Fair value of financial instruments, details:
Carrying amount of long-term debt	$ 21,915		$ 21,915		$ 21,846
Fair value of long-term debt	23,792		23,792		24,006
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost	8,994		8,994		7,801
Cash and cash equivalents, gross unrealized gains	0		0		0
Cash and cash equivalents, gross unrealized losses	0		0		0
Debt securities - current, Adjusted Cost	50		50		990
Debt securities - current, gross unrealized gains	0		0
Debt securities - current, gross unrealized losses					0
Debt securities - noncurrent, Adjusted Cost	6		6		6
Debt securities non-current gross unrealized gains	2		2		1
Debt securities non-current gross unrealized losses					0
Available-for-sale equity investments, Adjusted Cost	28		28		194
Available-for-sale equity investments, gross unrealized gains	31		31		264
Available-for-sale equity investments, gross unrealized losses	0		0		0
Cash and cash equivalents	8,994		8,994		7,801
Debt securities - current	50		50		990
Debt securities - noncurrent	8		8		7
Available-for-sale equity investments	59		59		458
Proceeds from sales of debt securities and marketable equity securities	87	4	402	13
Gross realized gains (before taxes) on sales of debt securities and marketable equity securities	29	1	232	5
Gross realized losses (before taxes) on sales of debt securities and marketable equity securities	(1)	(1)	(1)	(1)
Unrealized holding gains (losses) on available-for-sale debt and marketable securities
Net unrealized gains/(losses) arising during the period	(4)	(46)	(3)	(6)
Net unrealized (gains)/losses reclassified to net income	(18)	(1)	(142)	0
Writedowns included in net income for the period		0.1		3.2
Contractual maturities of substantially all available-for-sale debt securities	less than one year		less than one year
Time deposits and certificates of deposit
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost	4,975		4,975		2,473
Cash and cash equivalents, gross unrealized gains	0		0
Cash and cash equivalents, gross unrealized losses	0		0		0
Cash and cash equivalents	4,975		4,975		2,473
Commercial paper
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost	1,322		1,322		2,673
Cash and cash equivalents, gross unrealized gains	0		0
Cash and cash equivalents, gross unrealized losses					0
Debt securities - current, Adjusted Cost	50		50		490
Debt securities - current, gross unrealized gains	0		0
Debt securities - current, gross unrealized losses					0
Cash and cash equivalents	1,322		1,322		2,673
Debt securities - current	50		50		490
Money market funds
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost	2,624		2,624		1,532
Cash and cash equivalents	2,624		2,624		1,532
Foreign government securities
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost					1,054
Cash and cash equivalents					1,054
U.S. government securities
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost					44
Cash and cash equivalents, gross unrealized gains					0
Cash and cash equivalents, gross unrealized losses					0
Debt securities - current, Adjusted Cost					500
Debt securities - current, gross unrealized losses					0
Cash and cash equivalents					44
Debt securities - current					500
U.S. government agency securities
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost					22
Cash and cash equivalents, gross unrealized gains					0
Cash and cash equivalents, gross unrealized losses					0
Cash and cash equivalents					22
Other securities
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost	72		72		3
Debt securities - current, Adjusted Cost					1
Debt securities - current, gross unrealized losses					0
Debt securities - noncurrent, Adjusted Cost	6		6		6
Debt securities non-current gross unrealized gains	2		2		1
Debt securities non-current gross unrealized losses					0
Cash and cash equivalents	72		72		3
Debt securities - current					1
Debt securities - noncurrent	$ 8		$ 8		$ 7